This document provides definitions and examples of various logical fallacies. It begins by explaining that fallacies are flawed or dishonest arguments that can undermine the credibility of the writer. It emphasizes the importance of learning to identify fallacies in one's own arguments and those of others. The document then proceeds to define and provide examples of over 20 specific logical fallacies, including genetic fallacy, argumentum ad hominem, appeal to popularity, appeal to tradition, appeal to authority, argument from consequences, and others. It concludes by noting there are also component fallacies related to inductive and deductive reasoning.

1. Logical
Fallacies
Handlist:

2. •Fallacies are statements that might sound
reasonable or superficially true but are
actually flawed or dishonest. When readers
detect them, these logical fallacies backfire
by making the audience think the writer is
(a) unintelligent or (b) deceptive.

3. •It is important to avoid them in your own
arguments, and it is also important to be able to
spot them in others' arguments so a false line of
reasoning won't fool you. Think of this as
intellectual kung-fu: the vital art of self-defense
in a debate. For extra impact, learn both the Latin
terms and the English equivalents.

4. •These fallacies appeal to
evidence or examples that are
not relevant to the argument
at hand.

5. •This argument uses force, the threat of force, or some
other unpleasant backlash to make the audience
accept a conclusion. It commonly appears as a last
resort when evidence or rational arguments fail to
convince a reader. If the debate is about whether or
not 2+2=4, an opponent's argument that he will
smash your nose in if you don't agree with his claim
doesn't change the truth of an issue.

6. •Logically, this consideration has nothing to do with the
points under consideration. The fallacy is not limited
to threats of violence, however. The fallacy includes
threats of any unpleasant backlash--financial,
professional, and so on. Example: "Superintendent,
you should cut the school budget by $16,000. I need
not remind you that past school boards have fired
superintendents who cannot keep down costs."

7. •The genetic fallacy is the claim that an idea,
product, or person must be untrustworthy
because of its racial, geographic, or ethnic
origin. "That car can't possibly be any good!
It was made in Japan!" Or, "Why should I
listen to her argument?

8. •She comes from California, and we all know
those people are flakes." Or, "Ha! I'm not
reading that book. It was published in
Tennessee, and we know all Tennessee folk are
hillbillies and rednecks!" This type of fallacy is
closely related to the fallacy of argumentum ad
hominem or personal attack, appearing
immediately below.

9. • (Argumentum Ad Hominem, literally, "argument toward the
man." Also called "Poisoning the Well"): Attacking or
praising the people who make an argument, rather than
discussing the argument itself. This practice is fallacious
because the personal character of an individual is logically
irrelevant to the truth or falseness of the argument itself.
The statement "2+2=4" is true regardless if it is stated by
criminals, congressmen, or pastors.

10. • (1) Abusive: To argue that proposals, assertions, or
arguments must be false or dangerous because they
originate with atheists, Christians, Muslims, communists,
capitalists, the John Birch Society, Catholics, anti-
Catholics, racists, anti-racists, feminists, misogynists (or
any other group) is fallacious. This persuasion comes from
irrational psychological transference rather than from an
appeal to evidence or logic concerning the issue at hand.
This is similar to the genetic fallacy, and only an anti-
intellectual would argue otherwise.

11. •(2) Circumstantial: To argue that an opponent should
accept or reject an argument because of circumstances
in his or her life. If one's adversary is a clergyman,
suggesting that he should accept a particular argument
because not to do so would be incompatible with the
scriptures is such a fallacy. To argue that, because the
reader is a Republican or Democrat, she must vote for
a specific measure is likewise a circumstantial fallacy.

12. •The opponent's special circumstances have no
control over the truth or untruth of a specific
contention. The speaker or writer must find
additional evidence beyond that to make a strong
case. This is also similar to the genetic fallacy in
some ways. If you are a college student who
wants to learn rational thought, you simply must
avoid circumstantial fallacies.

13. •Using an appeal to popular assent, often by
arousing the feelings and enthusiasm of the
multitude rather than building an argument. It is
a favorite device with the propagandist, the
demagogue, and the advertiser. An example of
this type of argument is Shakespeare's version of
Mark Antony's funeral oration for Julius Caesar.

14. •(1) Bandwagon Approach: “Everybody is
doing it.” This argumentum ad populum
asserts that, since the majority of people
believes an argument or chooses a particular
course of action, the argument must be true,
or the course of action must be followed, or
the decision must be the best choice.

15. •For instance, “85% of consumers purchase
IBM computers rather than Macintosh; all
those people can’t be wrong. IBM must
make the best computers.” Popular
acceptance of any argument does not prove
it to be valid, nor does popular use of any
product necessarily prove it is the best one.

16. •After all, 85% of people may once have
thought planet earth was flat, but that
majority's belief didn't mean the earth really
was flat when they believed it! Keep this in
mind, and remember that everybody should
avoid this type of logical fallacy.

17. •(2) Patriotic Approach: "Draping oneself in
the flag." This argument asserts that a certain
stance is true or correct because it is
somehow patriotic, and that those who
disagree are unpatriotic. It overlaps with
pathos and argumentum ad hominem to a
certain extent.

18. •The best way to spot it is to look for emotionally
charged terms like Americanism, rugged
individualism, motherhood, patriotism, godless
communism, etc. A true American would never
use this approach. And a truly free man will
exercise his American right to drink beer, since
beer belongs in this great country of ours.This
approach is unworthy of a good citizen.

19. •(3) Snob Approach: This type of
argumentum ad populum doesn’t assert
“everybody is doing it,” but rather that “all
the best people are doing it.” For instance,
“Any true intellectual would recognize the
necessity for studying logical fallacies.”

20. •The implication is that anyone who
fails to recognize the truth of the
author’s assertion is not an
intellectual, and thus the reader had
best recognize that necessity.

21. •This line of thought asserts that a
premise must be true because people
have always believed it or done it.
For example, "We know the earth is
flat because generations have
thought that for centuries!"

22. •Alternatively, the appeal to tradition might conclude
that the premise has always worked in the past and
will thus always work in the future: “Jefferson City
has kept its urban growth boundary at six miles for
the past thirty years. That has been good enough for
thirty years, so why should we change it now? If it
ain’t broke, don’t fix it.” Such an argument is
appealing in that it seems to be common sense, but
it ignores important questions.

23. •An appeal to an improper authority, such as a
famous person or a source that may not be
reliable or who might not know anything about
the topic. This fallacy attempts to capitalize
upon feelings of respect or familiarity with a
famous individual. It is not fallacious to refer
to an admitted authority if the individual’s
expertise is within a strict field of knowledge.

24. •On the other hand, to cite Einstein to settle
an argument about education or economics
is fallacious. To cite Darwin, an authority on
biology, on religious matters is fallacious. To
cite Cardinal Spellman on legal problems is
fallacious. The worst offenders usually
involve movie stars and psychic hotlines.

25. •A subcategory is the Appeal to Biased Authority.
In this sort of appeal, the authority is one who
actually is knowledgeable on the matter, but one
who may have professional or personal
motivations that render his professional judgment
suspect: for instance, "To determine whether
fraternities are beneficial to this campus, we
interviewed all the frat presidents."

26. •An emotional appeal concerning what should be
a logical issue during a debate. While pathos
generally works to reinforce a reader’s sense of
duty or outrage at some abuse, if a writer tries to
use emotion merely for the sake of getting the
reader to accept what should be a logical
conclusion, the argument is a fallacy.

27. •For example, in the 1880s, prosecutors in a Virginia
court presented overwhelming proof that a boy was
guilty of murdering his parents with an ax. The
defense presented a "not-guilty" plea for on the
grounds that the boy was now an orphan, with no one
to look after his interests if the court was not lenient.
This appeal to emotion obviously seems misplaced,
and the argument is irrelevant to the question of
whether or not he did the crime.

28. • Asserting that an argument must be false because the
implications of it being true would create negative results.
For instance, “The medical tests show that Grandma has
advanced cancer. However, that can’t be true because then
she would die! I refuse to believe it!” The argument is
illogical because truth and falsity are not contingent based
upon how much we like or dislike the consequences of that
truth. Grandma, indeed, might have cancer, in spite of how
negative that fact may be or how cruelly it may affect us.

29. • Asserting that opponent’s argument must be false because
you personally don’t understand it or can’t follow its
technicalities. For instance, one person might assert, “I
don’t understand that engineer’s argument about how
airplanes can fly. Therefore, I cannot believe that airplanes
are able to fly.” Au contraire, that speaker’s own mental
limitations do not limit the physical world—so airplanes
may very well be able to fly in spite of a person's inability
to understand how they work. One person’s comprehension
is not relevant to the truth of a matter.

30. COMPONENT
FALLACIES:

31. •Component fallacies are errors
in inductive and deductive
reasoning or in syllogistic terms
that fail to overlap.

32. •If writers assume as evidence for their
argument the very conclusion they are
attempting to prove, they engage in the
fallacy of begging the question. The most
common form of this fallacy is when the
first claim is initially loaded with the very
conclusion one has yet to prove.

33. •For instance, suppose a particular student group
states, "Useless courses like English 101 should
be dropped from the college's curriculum." The
members of the student group then immediately
move on in the argument, illustrating that
spending money on a useless course is something
nobody wants. Yes, we all agree that spending
money on useless courses is a bad thing.

34. •However, those students never did prove that
English 101 was itself a useless course--they
merely "begged the question" and moved on to
the next "safe" part of the argument, skipping
over the part that's the real controversy, the heart
of the matter, the most important component.
Begging the question is often hidden in the form
of a complex question.

35. •Circular Reasoning is closely related to
begging the question. Often the writers using
this fallacy word take one idea and phrase it
in two statements. The assertions differ
sufficiently to obscure the fact that that the
same proposition occurs as both a premise
and a conclusion.

36. •The speaker or author then tries to "prove" his or her
assertion by merely repeating it in different words.
Richard Whately wrote in Elements of Logic
(London 1826): “To allow every man unbounded
freedom of speech must always be on the whole,
advantageous to the state; for it is highly conducive
to the interest of the community that each individual
should enjoy a liberty perfectly unlimited of
expressing his sentiments.”

37. •Obviously the premise is not logically irrelevant
to the conclusion, for if the premise is true the
conclusion must also be true. It is, however,
logically irrelevant in proving the conclusion. In
the example, the author is repeating the same
point in different words, and then attempting to
"prove" the first assertion with the second one.

38. •A more complex but equally fallacious type of
circular reasoning is to create a circular chain of
reasoning like this one: "God exists." "How do
you know that God exists?" "The Bible says so."
"Why should I believe the Bible?" "Because it's
the inspired word of God." If we draw this out as
a chart, it looks like this:

40. •The so-called "final proof" relies on unproven
evidence set forth initially as the subject of
debate. Basically, the argument goes in an
endless circle, with each step of the argument
relying on a previous one, which in turn relies on
the first argument yet to be proven. Surely God
deserves a more intelligible argument than the
circular reasoning proposed in this example!

41. •Mistaken use of inductive reasoning when
there are too few samples to prove a point.
Example: "Susan failed Biology 101.
Herman failed Biology 101. Egbert failed
Biology 101. I therefore conclude that most
students who take Biology 101 will fail it."

42. •." In understanding and characterizing general
situations, a logician cannot normally examine
every single example. However, the examples
used in inductive reasoning should be typical of
the problem or situation at hand. Maybe Susan,
Herman, and Egbert are exceptionally poor
students. Maybe they were sick and missed too
many lectures that term to pass.

43. •If a logician wants to make the case that most
students will fail Biology 101, she should (a) get a
very large sample--at least one larger than three--or
(b) if that isn't possible, she will need to go out of his
way to prove to the reader that her three samples are
somehow representative of the norm. If a logician
considers only exceptional or dramatic cases and
generalizes a rule that fits these alone, the author
commits the fallacy of hasty generalization.

44. •One common type of hasty
generalization is the Fallacy of Accident.
This error occurs when one applies a
general rule to a particular case when
accidental circumstances render the
general rule inapplicable.

45. •For example, in Plato’s Republic, Plato finds
an exception to the general rule that one
should return what one has borrowed:
“Suppose that a friend when in his right
mind has deposited arms with me and asks
for them when he is not in his right mind.
Ought I to give the weapons back to him?

46. •No one would say that I ought or that I
should be right in doing so. . . .” What is true
in general may not be true universally and
without qualification. So remember,
generalizations are bad. All of them. Every
single last one. Except, of course, for those
that are not.

47. •Another common example of this fallacy is the
misleading statistic. Suppose an individual
argues that women must be incompetent
drivers, and he points out that last Tuesday at
the Department of Motor Vehicles, 50% of the
women who took the driving test failed. That
would seem to be compelling evidence from the
way the statistic is set forth.

48. •This fallacy establishes a
cause/effect relationship that
does not exist. There are various
Latin names for various analyses
of the fallacy.

49. •(1) Non Causa Pro Causa
(Literally, "Not the cause for a
cause"): A general, catch-all
category for mistaking a false
cause of an event for the real
cause.

50. •(2) Post Hoc, Ergo Propter Hoc (Literally: "After
this, therefore because of this"): This type of false
cause occurs when the writer mistakenly assumes
that, because the first event preceded the second
event, it must mean the first event caused the later
one. Sometimes it does, but sometimes it doesn't. It is
the honest writer's job to establish clearly that
connection rather than merely assert it exists.

51. •Example: "A black cat crossed my
path at noon. An hour later, my mother
had a heart-attack. Because the first
event occurred earlier, it must have
caused the bad luck later." This is how
superstitions begin.

52. •This fallacy occurs when a
rhetorician adapts an argument
purporting to establish a particular
conclusion and directs it to prove a
different conclusion.

53. • For example, when a particular proposal for housing legislation is
under consideration, a legislator may argue that decent housing for
all people is desirable. Everyone, presumably, will agree. However,
the question at hand concerns a particular measure. The question
really isn't, "Is it good to have decent housing?" The question really
is, "Will this particular measure actually provide it or is there a
better alternative?" This type of fallacy is a common one in student
papers when students use a shared assumption--such as the fact that
decent housing is a desirable thing to have--and then spend the bulk
of their essays focused on that fact rather than the real question at
issue. It's similar to begging the question, above.

54. • For example, when a particular proposal for housing legislation is
under consideration, a legislator may argue that decent housing for
all people is desirable. Everyone, presumably, will agree. However,
the question at hand concerns a particular measure. The question
really isn't, "Is it good to have decent housing?" The question really
is, "Will this particular measure actually provide it or is there a
better alternative?" This type of fallacy is a common one in student
papers when students use a shared assumption--such as the fact that
decent housing is a desirable thing to have--and then spend the bulk
of their essays focused on that fact rather than the real question at
issue. It's similar to begging the question, above.